I searched for 'coins' in images and at the top of the results on screen 16 of the 22 results are exclusively Australian coins and the 6 remaining results were other coins. Is this a great coincidence that so many of the results happen to be from the country from which I conducted the search (Australia)?

Note: I searched from www.google.com, not from www.google.com.au

Question

How can I instruct Google to conduct the search from a generic, world wide perspective without changing the search term?